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Full form of AM and PM | what is the meaning of AM and PM?

What is the full form of AM and PM ? AM: Ante-Meridiem PM : post Meridiem The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to before midday) and p.m. (from Latin post meridiem translating to after midday).Each period consists of 12 hours numbered: 12 (acting as zero),[3] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. The 24 hour/day cycle starts at 12 midnight (usually indicated as 12 a.m.), runs through 12 noon (usually indicated as 12 p.m.), and continues just before midnight at the end of the day.  The 12-hour time convention is common in several English-speaking nations and former British colonies, as well as a few other countries. The natural day-and-night division of a calendar day forms the fundamental basis as to why each day is split into two cycles. Originally there were two cycles: one cycle which could be tracked by the position of the Sun (day), followed by one cycle which could b